The purpose of the temporary file is to enable Audition to make an automatic recovery from a crash. When you restart the program there should be an option to restart the previous session, from that file. I don't know of any other way to use or open it.

Just wondering if you used 3d party effects during recording or Mastering?

You can't use any effects at all in recording - they only operate on the monitor output. But this doesn't have anything at all to do with Mastering - it's entirely about what happens with temp files and session recovery.

It's just one time my CS6 session crashed during editing and I couldn't do anything with it. (Of course my waves were ok and safe, but only session was bad.) Until I tried to open it with CS5.5 and there I saw that Mastering effect was giving me problems.

I removed Mastering from my session and saved it with CS5.5 and then I could open it in CS6 again. It happened only once.

You can't use any effects at all in recording - they only operate on the monitor output.

What do you mean? Is it unwise to use effects for recording or useless?

I meant exactly what I said; it's not unwise or useless, it's simply not possible. If you apply an effect whilst recording, it only appears in the monitor output, and the track is always recorded dry, as per good industry practice. So if your vocalist wants reverb in the foldback, it's available - just not recorded. There is no way around this in Audition - if you are really desperate to be able to do it, you have to route the monitor output with the effect on to a spare output, and re-record that on a spare input.

If you leave the effect(s) on the track and replay it, then it will sound exactly as it did in the monitor output, but if you then remove them, you are left with the dry signal - which leaves you room to change your mind about exactly what effects to apply.

Yes, I understand that. But sometimest you need effects like Guitar Suite or IK Ampitube to monitor what you are recording. And when if effects like these or others are there, they may crash session. And you need to remove them or your session will not load. I don't know much about what happens with temp files and session recovery but I know that some effects sometimes (not always) crush your session to the point that you can not open it again with automatic recovery.

Yes, I understand that. But sometimest you need effects like Guitar Suite or IK Ampitube to monitor what you are recording. And when if effects like these or others are there, they may crash session. And you need to remove them or your session will not load. I don't know much about what happens with temp files and session recovery but I know that some effects sometimes (not always) crush your session to the point that you can not open it again with automatic recovery.

That's why really we need a developer comment. In principle it shouldn't happen, but it seems to.

The temp files aren't user-friendly at all. You MIGHT have luck opening them as *.RAW audio files (File > Import > Raw Data) but as far as I'm aware, there's not strictly a 1:1 correlation between a file in a session and a temp file.

If you remember the sample rate at which you recorded, you might have luck importing it as a raw file and specifying the appropriate values. You may also want to try renaming it as .WAV and opening it through the standard WAV importer.